tools/power/x86/intel-speed-select: Allow online/offline based on tdp

Using enable core mask, do online offline CPUs. There is a new option
--online|-o for set-config-level.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>